package org.apache.solr.search.function;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.FieldCache;

import java.io.IOException;
import java.util.Map;

/**
 * Obtains int field values from the {@link org.apache.lucene.search.FieldCache}
 * using <code>getInts()</code> and makes those values available as other
 * numeric types, casting as needed. *
 * 
 * @version $Id: IntFieldSource.java 555343 2007-07-11 17:46:25Z hossman $
 */

public class ByteFieldSource extends FieldCacheSource {
	FieldCache.ByteParser parser;

	public ByteFieldSource(String field) {
		this(field, null);
	}

	public ByteFieldSource(String field, FieldCache.ByteParser parser) {
		super(field);
		this.parser = parser;
	}

	@Override
	public String description() {
		return "byte(" + field + ')';
	}

	@Override
	public DocValues getValues(Map context, IndexReader reader)
			throws IOException {
		final byte[] arr = (parser == null) ? cache.getBytes(reader, field)
				: cache.getBytes(reader, field, parser);
		return new DocValues() {
			@Override
			public byte byteVal(int doc) {
				return arr[doc];
			}

			@Override
			public short shortVal(int doc) {
				return (short) arr[doc];
			}

			@Override
			public float floatVal(int doc) {
				return (float) arr[doc];
			}

			@Override
			public int intVal(int doc) {
				return (int) arr[doc];
			}

			@Override
			public long longVal(int doc) {
				return (long) arr[doc];
			}

			@Override
			public double doubleVal(int doc) {
				return (double) arr[doc];
			}

			@Override
			public String strVal(int doc) {
				return Byte.toString(arr[doc]);
			}

			@Override
			public String toString(int doc) {
				return description() + '=' + byteVal(doc);
			}

		};
	}

	@Override
	public boolean equals(Object o) {
		if (o.getClass() != ByteFieldSource.class)
			return false;
		ByteFieldSource other = (ByteFieldSource) o;
		return super.equals(other)
				&& (this.parser == null ? other.parser == null : this.parser
						.getClass() == other.parser.getClass());
	}

	@Override
	public int hashCode() {
		int h = parser == null ? Byte.class.hashCode() : parser.getClass()
				.hashCode();
		h += super.hashCode();
		return h;
	}
}
